Problem solved!
I just had to reboot Zend Framework
With php -s adress:port -t */ZendSkeletonAplication/public/ */www/zframework/public/index.php &
(with extension=mongo.so
in the /cli/php.ini
)
This command works for me, please adapt with your path and it should work for you as well.
So don't forget to do that if you have the same issue!